ALEXANDRIA, Va., June 9 -- United States Patent no. 12,286,516, issued on April 29, was assigned to TOYOBO Co. LTD. (Osaka, Japan).
"Film roll of heat-shrinkable polyester" was invented by Masafumi Inoue (Tsuruga, Japan) and Masayuki Haruta (Tsuruga, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention provides a heat-shrinkable polyester film roll obtained by winding a heat-shrinkable polyester film on a paper tube with primary shrinkage in the longitudinal direction and a shrinkage rate of 40% or more, wherein the film has a winding length of 1000 to 30000 m, a width of 50 to 1500 mm, and a thickness of 5-30 micro metre, the thickness irregularity of the film roll in the width direction is 20...